07-17-2014, 07:04 PM
As an aside I have two model 600's that both have open osc coils. I don't think they have the insulator but both pri and sec are open. As Ron noted they are a smaller size and a pain to rewind.
http://philcoradio.com/phorum/showthread...=model+600
Terry
http://philcoradio.com/phorum/showthread...=model+600
Terry